The first Junkers G31 delivered to Lufthansa at Croydon after the type's first international flight, via Amsterdam. From a Dutch newspaper I gather that the date should be 1 May 1928. The G31de was powered by Gnome-Rhône-built Bristol Jupiter engines. Aircraft named after the pilot of the Junkers W33 D-1167 Bremen. Later, D-1310 was converted to G31ho with lengthened fuselage and Pratt & Whitney Hornet engines. To D-ADIN in 1934. To German Air Ministry in 1935.